P20BB

Reductant Heater "A" Control Circuit Low

DTC P20BB, sometimes indicated as P20BB00 is an OBD diagnostic trouble code indicating a manufacturer-specific fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the air/fuel mixture causing reductant heater "a" control circuit low.

This code means that the reductant heater "A" control circuit is low. This can be caused by a number of things, including a defective heater, a wiring problem, or a problem with the controller.
To fix this problem, you'll need to diagnose and fix the underlying cause.

  • P20BB: Reductant Heater A Control Circuit Low
  • P20BB: Reductant Heater "A" Control Circuit Low
  • P20BB: Reductant heater control A – circuit low
  • P20BB 00: Reductant heater control A - circuit low

DTC Trouble Code Search
Bulletins

Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

  • 22-NA-112 - ELECTRICAL SYSTEM
    CHEVROLET: This technical bulletin provides repair information to correct a customer concern of 2020 - 2022 silverado and sierra equipped with diesel engine setting dtcs P20BB or P20C3.
  • 22-NA-112 - ENGINE AND ENGINE COOLING
    CHEVROLET: This technical bulletin provides repair information to correct a customer concern of 2020 - 2022 silverado and sierra equipped with diesel engine setting dtcs P20BB or P20C3.
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